Concept explainers
Interpretation:
The two amino acids arginine and serine can combine to from a dipeptide. The structure of two possible dipeptides formed from these two amino acids needs to be drawn.
Concept introduction:
Amino acids are organic compounds containing amino as well as acidic groups. The general molecular formula of an amino acid is as follows:
Here, R refers to different group for different amino acids. If there is more than one amino group present in an amino acid, they are considered as basic amino acids and if there is more than one carboxylic group then they are considered as acidic amino acids.
Amino acids are the simplest unit of a peptide chain. These amino acids are linked through peptide bonds and results in the formation of protein.
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Chemistry: Principles and Reactions
- What functional groups are found in all amino acids? How many different amino acids are found in naturally occurring proteins?arrow_forward(a) How many tripeptides can be made from glycine, alanine, and leucine, using each amino acid only once per tripeptide? (b) Write the structural formulas of these tripeptides and name them in the shorthand abbreviation used for showing amino acid sequences.arrow_forwardWhich of the following are true concerning the chemical bond that forms between the carboxyl (RCOOH) group of one amino acid and the amino (RCNH2) group of another? a.The bond is called a peptide bond. b.It is formed by inserting a water molecule between them. c.It is formed by a dehydration reaction. d.A polypeptide has more of these bonds than a protein.arrow_forward
- In what way is the structure of glycine different from that of the other 19 common amino acids?arrow_forwardIn a pleated sheet secondary structure for a protein a. describe the general shape of the protein backbone b. describe the general locations for the amino acid R groupsarrow_forwardWhich of the following describes the primary structure of proteins? a. The collective shape assumed by all of the chains in a protein containing multiple chains. b. The folding of an individual protein molecule. c. The regular repeated shape of the protein molecules backbone. d. The sequence of amino acids bonded together by peptide bonds.arrow_forward
- For the tripeptide SerArgIle which amino acid residues a. are hydrophilic b. are hydrophobic c. possess polar neutral R groups d. participate in two amide linkagesarrow_forward21-90 To what extent do lipids and carbohydrates play structural roles in living organisms? Do these roles differ in plants and in animals?arrow_forwardTo which family of mirror-image isomers do nearly all naturally occurring amino acids belong?arrow_forward
- Using the single letter abbreviations A, V, and L, as given in Table 22-1, list the tripeptides formed if alanine, valine, and leucine are all mixed together and peptide bonds are allowed to form in all possible combinations.arrow_forward22-62 Distinguish between intermolecular and intramolecular hydrogen bonding between backbone groups. Where in protein structures do you find one, and where do you find the other?arrow_forwardDraw the Lewis diagram for the DNA fragment that is complementary to the guanine-thymine-adenine DNA fragment.arrow_forward
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